How do I start "building" a universe in which red light radiation is the highest wavelenght radiation possible? I was wondering, if I lived in a universe in which red light is the "most powerfull" source of radiation, would I be able to detect a, for example, bright white light shining through my universe? or would it be impossible for me to build instruments able to do that?If so, would it appear to me as "black"? If energy is related to mass, than the highest source of energy in a certain type of universe dipends on the highest possible mass/space in said universe, right? If so, does the limit of m/s (untill the object colapses to form a black hole) dipend on the composition of the elements, atoms or elementary particles...?